Answer:
x = amount of pure acid to be added = 6.67ml
Step-by-step explanation:
George wishes to increase the percent of acid in 50ml of a 15% acid solution in water to 25% acid, how much pure acid must you add?
let
x = amount of pure acid to be added
15% of 50 + x = 25% of 50 + x
(0.15 * 50) + x = 0.25(50 + x)
7.5 + x = 12.5 + 0.25x
Collect like terms
x - 0.25x = 12.5 - 7.5
0.75x = 5
x = 5/0.75
x = 6.6666666666666
Approximately,
x = 6.67
x = amount of pure acid to be added = 6.67ml
Answer:
Step-by-step explanation:
1_| 1 -2 -5 6
<u> 1 -1 -6</u>
1 -1 -6 0
Q(x)= x^2 - x - 6
R: 0
Answer:
Year 2034
Step-by-step explanation:
In 2000, 64% had one or more pets
<em>Since decreasing at 1% per year, we can say:</em>
<em>In 2001, 63%</em>
<em>In 2002, 62%</em>
<em>In 2003, 61%</em>
<em>In 2004, 60%</em>
<em>And so on</em>
<em />
To go to 30% from 60% in 2004, we would need to decrease 60 - 30 = 30%, and that will occur after 30 more years. So that would be the year
2004 + 30 = 2034
So, year 2034
Answer: i need this too did you ever get the answer
Step-by-step explanation:
HELP
9514 1404 393
Answer:
x = √(w(w+z))
Step-by-step explanation:
The idea with a right-triangle figure of this sort is that all of the triangles are similar. Here, x is the short side of ∆ABC, and the hypotenuse of ∆BDC. This suggests you want to write a similarity statement involving the short side and hypotenuse.
BC/AC = DC/BC . . . . . short side/hypotenuse
BC² = AC·DC . . . . . . cross multiply
x² = (w+z)w . . . . . . substitute letter values
Taking the square root and rearranging to the form of the applicable answer choice, this is ...
